You can't see anything through a 50mm telescope. Telescopes are used to view distant objects in the sky, and a 50mm lens is far too small to be a telescope.

However, a 50mm lens is a common size for a camera lens. It's considered a "standard" lens and can be used for a variety of purposes, including:

* Everyday photography: Portraits, landscapes, and street photography.

* Nature photography: Capturing birds, wildlife, and flowers.

* Travel photography: Documenting your adventures.

It's important to note that a 50mm lens alone won't give you the same magnification as a telescope. A 50mm lens will not allow you to see the rings of Saturn, the craters on the moon, or distant galaxies.

If you are interested in astronomy, I recommend looking into telescopes with much larger apertures, starting at around 100mm for a decent viewing experience.